Balancer slides in on install

A lot of discussion. I can add as a retired machinist and having built many Mopar’s of my own :

All dampers started with larger bore stepped to a smaller interference fit to finish off.

I never had to measure the bore but I can tell you even a same size bore is difficult to install. I would doubt there is a .001 (larger) press fit. More like .0005. That half 1000th makes a big difference. And I don’t think the entire shaft would be the same as I mentioned before that at first the damper starts easier.